That pop-up does not indicate a real virus. This discussion on an Apple forum may be helpful: https://discussions.apple.com/thread/6770575?tstart=0 https://di

That pop-up does not indicate a real virus. This discussion on an Apple forum may be helpful: https://discussions.apple.com/thread/6770575?tstart=0 https://discussions.apple.com/thread/6770575?tstart=0 Historically MacOS X has had few real viruses that were found "in the wild" (outside of controlled networks set up to test a potential exploit). There have been some recent Trojan Horses -- for example, a version of the Transmission application had ransomware in it. The media tends not to make a very clear distinction between viruses, remote exploits, and Trojan Horses, which doesn't help matters.